.main_menu {
    position: absolute;
    top: 0;
    left: 0;
    width: 120px;
    height: 470px;
    text-align: center;
    box-shadow: 2px 3px 5px #eee;
    box-sizing: border-box;
    padding-top: 35px;
    .tool_icon {
        margin-top: 40px;
        cursor: pointer;
    }
}